Combustion Training Course, ANSYS Fluent

Description

Combustion Training Course Introduction

After passing this Combustion Training Course, you can claim yourself as a Combustion CFD Simulation expert.

Combustion is a high-temperature exothermic chemical reaction between a fuel and oxygen, usually producing gaseous products such as CO2 and water vapor. Combustion is usually accompanied by light, high temperature, and extreme energy release, which we conceive as flame.

Since the discovery of fire by the first human being, combustion and fire has been the most significant source of energy that he needs in life, with contemporary applications in boilers, burners, furnaces, and so on.

Therefore, one of the essential aspects of combustion is how much fuel and oxidant are needed in a boiler’s combustion chamber to release a certain amount of energy needed to operate an electric plant. In this regard, the most incredible tool to predict and calculate the needed amount of fuel and oxidant and predict the released energy is considered to be CFD.

ANSYS Fluent is a powerful tool that can come to help. The implemented models in this software can predict even the slightest fluctuations in temperature change due to a combustion process and heat release. Hence, CFD is considered a powerful tool for modeling combustion and designing different and efficient types of combustion chambers.

What do you learn in this Combustion Training Course?

In this training course, you will learn how to set up the needed settings for modeling the combustion process using the species transport model within any domain.

Different techniques and simulation models, including different turbulence-chemistry interactions such as Finite rate (No TCI), Eddy dissipation, and Eddy dissipation/Finite rate, are explained in detail, along with step-by-step instructions on how to simulate pollution formation such as NOx, SOx, and Soot in Fluent. You will first learn about each model’s basics and then learn tricks and tips on performing exact and accurate combustion simulations.

This course is presented in a way that is as practical as possible so that the graduates can work well with this software to generate high-fidelity combustion simulations after the end of the training course.

Syllabus

This course contains 10 video lessons and a final project as an exam to get the Combustion Certification.

This course is divided into nine main lessons and some sub-lessons. You strongly recommend that you do not skip any of the sections even if you feel you know the content.

Lesson 1

In this lesson, you will first see a general introduction to combustion and an overview of available simulation techniques and models in ANSYS Fluent. This section contains the following subsections:

• Introduction and overview of the combustion
• Introduction to different combustion applications
• Overview of different related physics to combustion
• Physics of combustion

o   Premixed combustion

o   Non-premixed combustion

o   Partially premixed combustion

• Summary of different fast and finite rate chemistry models implemented in ANSYS Fluent

Lesson 2

In this lesson, you will learn about Non-premixed combustion modeling using the Eddy Dissipation approach by performing a simple project investigating combustion inside a combustion chamber. This section contains the following subsections:

• Overview of the needed setups and settings, including:

o   Mixture material selection

o   Importing Chemkin mechanism

o   Volumetric combustion

o   Chemistry-turbulence interaction

o   Coal calculator

o   Wall surface, particle surface, and electrochemical

o   Chemistry solvers

o   Inlet diffusion, thermal diffusion, …

o   Select boundary species, reported residuals

o   Thermodynamic database

• Extracting graphical contours
• Analyzing the data

Lesson 3

In this lesson, we will discuss Premixed combustion modeling using the Eddy Dissipation approach by performing a simple project investigating the combustion inside a combustion chamber. This section contains the following subsections:

• How to define stoichiometric mass fractions for fuel and air
• Extracting graphical contours
• Analyzing the data

Lesson 4

In this lesson, we will talk about Premixed combustion modeling using the Eddy Dissipation/Finite Rate approach and investigate Pollution Formation by performing a simple project by investigating the combustion inside a combustion chamber. This section contains the following subsections:

• Axisymmetric combustion chamber modeling
• NOx formation

o   thermal NOx

o   prompt NOx

• Soot formation

o   one step

o   two-step

• Decoupled detailed chemistry
• Reactor network
• Extracting graphical contours
• Analyzing the data

Lesson 5

In this lesson, we will discuss the Premixed Combustion modeling using the Finite rate/No TCI approach by performing a simple project investigating the combustion inside a boiler’s fire tube. This section contains the following subsections:

• Importing checking mechanism
• Relax to chemical equilibrium chemistry solver
• Selecting boundary species
• Extracting graphical contours
• Analyzing the data

Lesson 6

In this lesson, we will talk about Non-premixed Combustion. We model the combustion process inside a combustion chamber with separate inlet boundaries for fuel and air by assuming Chemical Equilibrium among chemical reactants and products. This section contains the following subsections:

• Chemical equilibrium state relation
• Adiabatic or non-adiabatic
• Fuel stream-rich flammability limit
• Creating a PDF table for combustion
• Analyzing the data

Lesson 7

In this lesson, we will talk about Non-premixed combustion. We model the combustion process inside a combustion chamber with separate inlet boundaries for fuel and air by assuming a steady diffusion flamelet submodel which assumes the turbulent flame to be composed of many laminar flame brushes. This section contains the following subsections:

• Steady-state diffusion flamelet model
• Creating flamelet through checking mechanism
• Creating a PDF table for combustion
• Analyzing the data

Lesson 8

In this lesson, we will talk about partially-premixed combustion. We model the combustion process inside a combustion chamber with integrated inlet boundaries for fuel and air by assuming chemical equilibrium among chemical reactants and products. This section contains the following subsections:

• Chemical equilibrium model
• Non-adiabatic combustion
• Creating a PDF table for combustion
• Using Simmons flame speed model
• Analyzing the data

Lesson 9

The last lesson will discuss partial differential function (PDF) transport model combustion composition. We will first model the combustion process inside the chamber using what we learned from the previous chapter to obtain an initial solution for the PDF transport model.

In the second part, we will show you how to decrease the computation time by considering a few assumptions. Finally, we will put the considered assumption aside and fully employ the PDF transport model to obtain a final and accurate solution. This section contains the following subsections:

• Partially premixed+equilibirium model as an initial solution
• ISAT table
• Chemistry agglomoration
• Pure composition PDF transport model
• Analyzing the data

Lesson 10

This lesson will discuss Wet Combustion Using the DPM Combusting Particle model. To replicate the burning of anthracite volatile, this technique uses combusting particles to create a simulated combustion chamber. We aim to follow fuel particles as they devolatilize or oxidize, releasing gases like carbon dioxide and water vapor. This section contains the following subsections:

• Species Transport Model
• Volumetric combustion
• DPM combusting particle
• Wet particles